Helicopter rotor blades
US5199851A · kind A · utility
11Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1991 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Oct 23, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A helicoper rotor blade includes at its outer end a tip vane having a mean chord length greater than fifty percent of a chord length of a blade central portion and a span length greater than fifty percent of the blade chord which in operation generates two approximately equal strength tip vortices to reduce an acoustic impulse and a resulting noise known as blade slap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.